Hermann I and his wife founded the Augustinian monastery of Backnang Abbey. It quickly became dilapidated, and was rebuilt by their son in 1123. Subsequently, the monastery was the resting place for five generations of the margraves of Baden.

When Herman's father became duke of Carinthia in 1061, Herman received the title of Margrave of Verona. While he never ruled in Verona, a dependency of Carinthia, the margrave title was to remain with his descendants. He was also count of the Breisgau.

In 1073 Hermann separated from his wife, took monastic vows, and became a lay brother in Cluny Abbey, where he died. He is celebrated in the Catholic Church on April 25.